belt tensioner is bad or one of your pulleys that the belt rides on is bad or out of alignment.
The belt tensioner is probably bad.
No only if it's a broken cam belt
Belt dressing if the belt is in good condition. Make sure that it is not a pulley squeaking and if the belt is in bad shape replace it.
No, an accessory belt is not considered a serpentine belt. However, a serpentine belt is considered a specific type of accessory belt.
Did a mechanic look at your serpentine belt and tell you it is bad? If he did, it is probably bad. Open your hood. Take a look at it and feel it. Do you see or feel any cracks? Do you see any places where rubber is breaking off? If you do, it is bad. Replace it.
Possibly the wrong belt was installed or most likely your belt tensioner is bad.
The belt is bad if it has 3 cracks per square inch.
A squeaky belt is usually caused by a bad belt, a missaligned pulley, or something leaking on the belt.
it looks as if there are small cracks on the pulley side of the belt. If these are within 1/8" of one another you need a new belt NOW
You probably have a bad serpentine belt and tensioner.
The serpentine belt would be the same as the accessory drive belt.